package ooday05homework_vls;
import ooday05homework.Aoo;
public class Coo {//同包演示
    void show() {
        Aoo o =new Aoo();
        o.a=1;

    }
}

class Doo extends Aoo {//跨包继承演示protected
    void show() {
        a=1;
        b=2;

    }
}